EP3944998B1 - Electronic parking brake actuator - Google Patents

Electronic parking brake actuator Download PDF

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Publication number
EP3944998B1
EP3944998B1 EP21185509.3A EP21185509A EP3944998B1 EP 3944998 B1 EP3944998 B1 EP 3944998B1 EP 21185509 A EP21185509 A EP 21185509A EP 3944998 B1 EP3944998 B1 EP 3944998B1
Authority
EP
European Patent Office
Prior art keywords
gear
motor
assembly
accommodation cavity
planetary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21185509.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3944998A1 (en
Inventor
Wenjun Yang
Sheng JIAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hufan Automobile Electronic System Co Ltd
Original Assignee
Hufan Automobile Electronic System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hufan Automobile Electronic System Co Ltd filed Critical Hufan Automobile Electronic System Co Ltd
Publication of EP3944998A1 publication Critical patent/EP3944998A1/en
Application granted granted Critical
Publication of EP3944998B1 publication Critical patent/EP3944998B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/50—Rotating members in mutual engagement with parallel non-stationary axes, e.g. planetary gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms

Definitions

  • the present invention relates to an electronic parking brake actuator.
  • the electronic parking brake is also called electronic handbrake, it refers to a technology that integrates temporary braking during driving and long-term braking after parking, and realizes parking braking by electronic control.
  • electronic handbrake it refers to a technology that integrates temporary braking during driving and long-term braking after parking, and realizes parking braking by electronic control.
  • its advantage is that the driver can directly push/pull the parking electric control switch to drive the motor to achieve parking, rather than using hands or feet to exert a large operating force on the parking rod mechanism of the vehicle to achieve parking.
  • the actuator of the electronic parking brake includes a motor and a transmission mechanism.
  • the traditional mechanism reduces the output speed of the motor while increasing the output torque transmitted to the brake caliper to realize the parking function.
  • the transmission mechanism can adopt a variety of transmission modes, such as belt transmission mechanism, worm transmission mechanism, cylindrical gear transmission mechanism, planetary gear transmission mechanism and so on. In order to obtain a specific reduction ratio, a multi-stage transmission can also be used. Compared with its transmission mode, the planetary gear transmission has the advantages of high reduction ratio, compact structure and stable operation.
  • DE 10 2010 032 053 A1 discloses a sub-assembly for an electro-mechanical brake actuator of an electric parking brake.
  • the sub-assembly has a drive device for generating torque, where a transmission device has three gear stages in a row for transmitting the torque.
  • FIG. 1 is a schematic diagram of a current common electronic parking brake actuator.
  • the electronic parking brake actuator includes a housing 001, an upper cover 003, a motor 002 placed in the housing 001.
  • a belt transmission mechanism 004 and the planetary gear transmission mechanism 005 are connected downstream of the motor 002 in sequence.
  • the belt transmission mechanism 004 is driven by the motor 002 to reduce the speed of the motor 002 and increase the torque, and output the torque to the caliper of the brake through the output component, thereby realizing the parking function.
  • the common planetary gear transmission mechanism includes the following transmission components: an inner ring gear, a sun gear, a planet carrier, and two to four planet gears mounted on the planet carrier.
  • the planetary gear is engaged with the ring gear and the sun gear.
  • the inner gear ring is a fixed part
  • the sun gear is connected with an external driving device (belt transmission mechanism) as a driving part
  • the planet carrier is a driven part.
  • the sun gear can rotate and revolve along the inner gear, thereby driving the planetary carrier to rotate and output torque.
  • the arrow direction is the torque transmission direction of a common planetary gear transmission
  • the torque output point (the output part of the planet carrier) is located at the far end of the torque input point (sun gear) in the axial direction. Therefore, in order to obtain sufficient braking torque (reduction ratio), the common electronic parking brake actuator can only be arranged in a coaxially stacked multi-stage planetary gear transmission mechanism, and the planet carrier output part of the previous stage planetary gear transmission mechanism also serves as the sun gear of the next-stage planetary gear transmission mechanism, such that torque can continue to be transmitted.
  • the limitation of this common electronic parking brake actuator is that since the two-stage planetary gear transmission mechanism is coaxially stacked, its axial dimension is relatively large, and it has high requirements for longitudinal (axial) space when assembling the whole vehicle, and needs to make greater adjustments to peripheral parts.
  • the technical problem to be solved by the present invention is to provide an electronic parking brake actuator with simpler structure, higher precision, higher production and transmission efficiency in view of the shortcomings of the existing electronic parking brake actuator.
  • An electronic parking brake actuator including:
  • a second end in the axial direction of the motor accommodation cavity is covered with a motor cover, and the motor cover encloses the motor in the motor accommodation cavity, a motor wave spring is provided between the motor cover and the motor.
  • the primary transmission gear assembly is sleeved on a primary gear positioning pin, a lower end of the primary gear positioning pin is pressed into the gearbox body in an online press-fitting manner.
  • the secondary transmission gear assembly is mounted on the gearbox cover through a secondary gear positioning pin, wherein an upper end of the secondary gear positioning pin is mounted on the gearbox cover, and a lower end of the secondary gear positioning pin is press-fitted on the sun gear;
  • the sun gear is manufactured by powder metallurgy, and the fourth gear is injection-molded with a middle part between the sun gear and the secondary gear positioning pin as an insert.
  • the planetary gear carrier is uniformly provided with a plurality of planetary gear shafts circumferentially on the first end surface in the axial direction, and the plurality of planetary gear shafts, the planetary gear carrier and the output spline are integrally injection molded; each planetary gear is assembled on a corresponding planetary gear shaft.
  • the present invention has the advantages of simpler structure, higher precision, higher production and transmission efficiency.
  • the electronic parking brake actuator 100 shown in the figures may include a gearbox body 10, a gearbox cover 20, a motor 30, a primary transmission gear assembly 40, a secondary transmission gear assembly 50 and a planetary gear transmission assembly 60.
  • the gearbox body 10 may be provided with a motor accommodation cavity 11 and a gear train accommodation cavity 12, and a connector socket 13 may be provided on the outer side of the gearbox body 10, and an electrical connector (not shown in the figures) may be provided in the connector socket 13.
  • the first end 11a of the motor accommodation cavity 11 in the axial direction may be in communication with the gear train accommodation cavity 12.
  • An inner gear ring 14 may be provided in the gear train accommodation cavity 12, and the gear train accommodation cavity 12 may be provided with an output spline hole 15 on the gearbox body corresponding to the center position of the inner gear ring 14.
  • the motor 30 may be provided in the motor accommodation cavity 11, the output shaft 31 of the motor 30 may extend into the gear train accommodation cavity 12, and a first gear 32 may be fixed on the output shaft 31 of the motor 30.
  • a motor cover 16 may be covered at the second end 11b of the motor accommodation cavity 11 in the axial direction.
  • the motor cover 16 encloses the motor 30 in the motor accommodation cavity 11.
  • a motor wave spring 33 may be provided between the motor cover 16 and the motor 30, to adjust the axial gap of the motor 30.
  • the lead wires on the motor 30 may be electrically connected to the electrical connector in the connector socket 13.
  • the primary transmission gear assembly 40 can be rotatably fitted in the gear train accommodation cavity 12. Specifically: referring to FIGS. 5 and 6 , the lower end of the primary gear positioning pin 41 may be pressed into the primary gear positioning pin hole 17 of the gearbox body 10 by means of online press-fitting, and the primary transmission gear assembly 40 may be sleeved in the primary gear positioning pin 41, so as to reduce the deformation caused by the injection molding process of the primary gear positioning pin 41 (the primary gear positioning pin 41 and the gearbox body 10 are formed by one-time injection molding in the prior art).
  • the online press-fitting method adopted in the present invention is specifically: the primary positioning pin 41 and the primary gear positioning pin hole 17 corresponding to the gearbox body 10 may be designed for interference fit, and the primary positioning pin 41 may be assembled to the hole corresponding to the gearbox by an online automatic press-fitting process.
  • the press-in force and press-in stroke of the positioning pin 41 may be 100% monitored during the press-fitting process.
  • the primary transmission gear assembly 40 may be composed of a second gear 42 and a third gear 43 that are coaxially arranged and rotate synchronously, and the second gear 42 and the third gear 43 may be formed by one-time injection molding.
  • the secondary transmission gear assembly 50 can also be rotatably fitted in the gear train accommodation cavity 12.
  • the secondary transmission gear assembly 50 may be composed of a fourth gear 51 and a sun gear 52 that are coaxially arranged and synchronously rotating. Referring to FIGS. 7 to 9 , the secondary transmission gear assembly 50 may be mounted on the gearbox cover 20 through the secondary gear positioning pin 53. The upper end of the secondary gear positioning pin 53 may be assembled on the gearbox cover 20, and the lower end of the secondary gear positioning pin 53 may be press-fitted in the central hole 52a of the sun gear 52.
  • the sun gear 52 may be manufactured by powder metallurgy, and the fourth gear 51 may be injection-molded through the middle part between the sun gear 52 and the secondary gear positioning pin 53 as an insert.
  • a concave-convex structure 52b may be provided on the outer periphery of the sun gear 52, so that the fourth gear 51 and the sun gear 52 may be more firmly engaged.
  • the planetary gear transmission assembly 60 may include a planetary gear carrier 61, four planetary gears 62 and an output spline 63.
  • a planetary gear carrier 61 On the first end surface 61a of the planetary gear carrier 61 in the axial direction, four planetary gear shafts 64 are uniformly arranged in the circumferential direction, and the output spline 63 is arranged on the second end surface 61b of the planetary gear carrier 61 in the axial direction.
  • Four planetary gear shafts 64, the planetary gear carrier 61 and the output spline 63 may be integrally molded by injection molding.
  • Each planetary gear 62 may be assembled on the corresponding planetary shaft 64, so that the four planetary gears 62 may be rotatably arranged on the first end surface 61a of the planetary carrier 61 in the axial direction .
  • the gearbox cover 20 may cover the gearbox body 10, and the primary transmission gear assembly 40, the secondary transmission gear assembly 50 and the planetary gear transmission assembly 60 are packaged in the gear train accommodation cavity 12, and the output spline 63 extends out of the gearbox body 10 from the output spline hole 15 to output power.
  • the central axis of the first gear 32 is paralleled to the central axis of the planetary gear transmission assembly 60, the central axis of the secondary transmission gear assembly 50 and the central axis of the primary transmission gear assembly 40, and the central axis of the secondary transmission gear assembly 50 coincides with the central axis of the planetary gear drive assembly 60.
  • the engage relationship of the present invention is: the second gear 42 is engaged with the first gear 32, the fourth gear 51 is engaged with the third gear 43, the sun gear 52 is engaged with the four planet gears 62, and the four planet gears 62 are engaged with the inner ring gear 14.
  • the working principle of the present invention is as follows: the motor 30 drives the first gear 32 to rotate, the first gear 32 drives the second gear 42 to rotate through engaging, the second gear 42 drives the third gear 43 to rotate, and the third gear 43 drives the fourth gear 51 to rotate through engaging, the fourth gear 51 drives the sun gear 52 to rotate, the sun gear 52 drives the four planet gears 62 to rotate through engaging, and the four planet gears 62 revolve through engaging with the inner ring gear 14, and finally drive the planet gear carrier 61 to rotate, the planetary gear carrier 61 drives the output spline 63 to rotate, such that the power can be outputted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Retarders (AREA)
EP21185509.3A 2020-07-28 2021-07-14 Electronic parking brake actuator Active EP3944998B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010740065.5A CN111795093A (zh) 2020-07-28 2020-07-28 电子驻车制动器执行装置

Publications (2)

Publication Number Publication Date
EP3944998A1 EP3944998A1 (en) 2022-02-02
EP3944998B1 true EP3944998B1 (en) 2022-08-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21185509.3A Active EP3944998B1 (en) 2020-07-28 2021-07-14 Electronic parking brake actuator

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EP (1) EP3944998B1 (zh)
CN (1) CN111795093A (zh)
WO (1) WO2022022244A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111795093A (zh) * 2020-07-28 2020-10-20 沪帆汽车电子系统有限公司 电子驻车制动器执行装置
CN113389827A (zh) * 2021-07-13 2021-09-14 沪帆汽车电子系统有限公司 一种电子驻车制动器执行装置
WO2023122979A1 (zh) * 2021-12-28 2023-07-06 德昌电机(江门)有限公司 电动调节阀及其执行器
CN115261189A (zh) * 2022-10-08 2022-11-01 深圳中旭细胞再生医学研究有限公司 一种造血干细胞分离机

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DE102010032053A1 (de) * 2010-07-23 2012-01-26 Lucas Automotive Gmbh Unterbaugruppe für einen elektromechanischen Bremsaktuator
JP5888273B2 (ja) * 2012-08-28 2016-03-16 株式会社アドヴィックス 電動パーキングブレーキ用駆動装置
CN106641039B (zh) * 2015-07-27 2019-06-21 长城汽车股份有限公司 制动系统的驻车执行器及制动系统
CN105946836A (zh) * 2016-04-22 2016-09-21 宁波格陆博科技有限公司 用于车辆制动系统的电子驻车执行器
CN105905083A (zh) * 2016-05-20 2016-08-31 浙江万向精工有限公司 电子驻车制动器总成
KR101985878B1 (ko) * 2017-10-26 2019-06-07 계양전기 주식회사 이중기어를 갖는 전자식 주차 브레이크 액츄에이터
KR101985876B1 (ko) * 2017-10-26 2019-06-07 계양전기 주식회사 브러시카드 일체형 하우징을 갖는 전자식 주차 브레이크 액츄에이터
CN110550010B (zh) * 2018-05-30 2022-04-05 长城汽车股份有限公司 电子驻车执行器及车辆
CN110529592A (zh) * 2019-09-10 2019-12-03 芜湖伯特利汽车安全系统股份有限公司 应用于电子驻车系统的执行机构
CN111284468A (zh) * 2020-04-08 2020-06-16 格陆博科技有限公司 一种用于车辆电子驻车系统的紧凑型执行器
CN111795093A (zh) * 2020-07-28 2020-10-20 沪帆汽车电子系统有限公司 电子驻车制动器执行装置
CN212509301U (zh) * 2020-07-28 2021-02-09 沪帆汽车电子系统有限公司 电子驻车制动器执行装置

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Publication number Publication date
CN111795093A (zh) 2020-10-20
WO2022022244A1 (zh) 2022-02-03
EP3944998A1 (en) 2022-02-02

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